Lec045.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import pandas as pd\n",
    "from pandas import Series, DataFrame"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<img src=\"split_apply_combine.jpeg\" width=\"90%\" />"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "tags": []
   },
   "outputs": [
    {
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       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>fixed acidity</th>\n",
       "      <th>volatile acidity</th>\n",
       "      <th>citric acid</th>\n",
       "      <th>residual sugar</th>\n",
       "      <th>chlorides</th>\n",
       "      <th>free sulfur dioxide</th>\n",
       "      <th>total sulfur dioxide</th>\n",
       "      <th>density</th>\n",
       "      <th>pH</th>\n",
       "      <th>sulphates</th>\n",
       "      <th>alcohol</th>\n",
       "      <th>quality</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>7.4</td>\n",
       "      <td>0.70</td>\n",
       "      <td>0.00</td>\n",
       "      <td>1.9</td>\n",
       "      <td>0.076</td>\n",
       "      <td>11.0</td>\n",
       "      <td>34.0</td>\n",
       "      <td>0.9978</td>\n",
       "      <td>3.51</td>\n",
       "      <td>0.56</td>\n",
       "      <td>9.4</td>\n",
       "      <td>5</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>7.8</td>\n",
       "      <td>0.88</td>\n",
       "      <td>0.00</td>\n",
       "      <td>2.6</td>\n",
       "      <td>0.098</td>\n",
       "      <td>25.0</td>\n",
       "      <td>67.0</td>\n",
       "      <td>0.9968</td>\n",
       "      <td>3.20</td>\n",
       "      <td>0.68</td>\n",
       "      <td>9.8</td>\n",
       "      <td>5</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>7.8</td>\n",
       "      <td>0.76</td>\n",
       "      <td>0.04</td>\n",
       "      <td>2.3</td>\n",
       "      <td>0.092</td>\n",
       "      <td>15.0</td>\n",
       "      <td>54.0</td>\n",
       "      <td>0.9970</td>\n",
       "      <td>3.26</td>\n",
       "      <td>0.65</td>\n",
       "      <td>9.8</td>\n",
       "      <td>5</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>11.2</td>\n",
       "      <td>0.28</td>\n",
       "      <td>0.56</td>\n",
       "      <td>1.9</td>\n",
       "      <td>0.075</td>\n",
       "      <td>17.0</td>\n",
       "      <td>60.0</td>\n",
       "      <td>0.9980</td>\n",
       "      <td>3.16</td>\n",
       "      <td>0.58</td>\n",
       "      <td>9.8</td>\n",
       "      <td>6</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <td>7.4</td>\n",
       "      <td>0.70</td>\n",
       "      <td>0.00</td>\n",
       "      <td>1.9</td>\n",
       "      <td>0.076</td>\n",
       "      <td>11.0</td>\n",
       "      <td>34.0</td>\n",
       "      <td>0.9978</td>\n",
       "      <td>3.51</td>\n",
       "      <td>0.56</td>\n",
       "      <td>9.4</td>\n",
       "      <td>5</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "   fixed acidity  volatile acidity  citric acid  residual sugar  chlorides   \n",
       "0            7.4              0.70         0.00             1.9      0.076  \\\n",
       "1            7.8              0.88         0.00             2.6      0.098   \n",
       "2            7.8              0.76         0.04             2.3      0.092   \n",
       "3           11.2              0.28         0.56             1.9      0.075   \n",
       "4            7.4              0.70         0.00             1.9      0.076   \n",
       "\n",
       "   free sulfur dioxide  total sulfur dioxide  density    pH  sulphates   \n",
       "0                 11.0                  34.0   0.9978  3.51       0.56  \\\n",
       "1                 25.0                  67.0   0.9968  3.20       0.68   \n",
       "2                 15.0                  54.0   0.9970  3.26       0.65   \n",
       "3                 17.0                  60.0   0.9980  3.16       0.58   \n",
       "4                 11.0                  34.0   0.9978  3.51       0.56   \n",
       "\n",
       "   alcohol  quality  \n",
       "0      9.4        5  \n",
       "1      9.8        5  \n",
       "2      9.8        5  \n",
       "3      9.8        6  \n",
       "4      9.4        5  "
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dframe_wine = pd.read_csv('winequality-red.csv', sep=';')\n",
    "dframe_wine.head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "def ranker(df):\n",
    "    df['alc_content_rank'] = np.arange(len(df)) + 1\n",
    "    return df"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "# アルコール度数で並べ替えます。\n",
    "dframe_alc_rank = dframe_wine.sort_values('alcohol', ascending=False)\n",
    "\n",
    "# groupbyのあと、先ほどの関数を適用します。\n",
    "dframe_alc_rank = dframe_alc_rank.groupby('quality').apply(ranker)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "tags": []
   },
   "outputs": [
    {
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       "  <thead>\n",
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       "      <th></th>\n",
       "      <th></th>\n",
       "      <th>fixed acidity</th>\n",
       "      <th>volatile acidity</th>\n",
       "      <th>citric acid</th>\n",
       "      <th>residual sugar</th>\n",
       "      <th>chlorides</th>\n",
       "      <th>free sulfur dioxide</th>\n",
       "      <th>total sulfur dioxide</th>\n",
       "      <th>density</th>\n",
       "      <th>pH</th>\n",
       "      <th>sulphates</th>\n",
       "      <th>alcohol</th>\n",
       "      <th>quality</th>\n",
       "      <th>alc_content_rank</th>\n",
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       "    <tr>\n",
       "      <th>quality</th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
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       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
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       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th rowspan=\"5\" valign=\"top\">3</th>\n",
       "      <th>899</th>\n",
       "      <td>8.3</td>\n",
       "      <td>1.020</td>\n",
       "      <td>0.02</td>\n",
       "      <td>3.40</td>\n",
       "      <td>0.084</td>\n",
       "      <td>6.0</td>\n",
       "      <td>11.0</td>\n",
       "      <td>0.99892</td>\n",
       "      <td>3.48</td>\n",
       "      <td>0.49</td>\n",
       "      <td>11.00</td>\n",
       "      <td>3</td>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1299</th>\n",
       "      <td>7.6</td>\n",
       "      <td>1.580</td>\n",
       "      <td>0.00</td>\n",
       "      <td>2.10</td>\n",
       "      <td>0.137</td>\n",
       "      <td>5.0</td>\n",
       "      <td>9.0</td>\n",
       "      <td>0.99476</td>\n",
       "      <td>3.50</td>\n",
       "      <td>0.40</td>\n",
       "      <td>10.90</td>\n",
       "      <td>3</td>\n",
       "      <td>2</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>690</th>\n",
       "      <td>7.4</td>\n",
       "      <td>1.185</td>\n",
       "      <td>0.00</td>\n",
       "      <td>4.25</td>\n",
       "      <td>0.097</td>\n",
       "      <td>5.0</td>\n",
       "      <td>14.0</td>\n",
       "      <td>0.99660</td>\n",
       "      <td>3.63</td>\n",
       "      <td>0.54</td>\n",
       "      <td>10.70</td>\n",
       "      <td>3</td>\n",
       "      <td>3</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1478</th>\n",
       "      <td>7.1</td>\n",
       "      <td>0.875</td>\n",
       "      <td>0.05</td>\n",
       "      <td>5.70</td>\n",
       "      <td>0.082</td>\n",
       "      <td>3.0</td>\n",
       "      <td>14.0</td>\n",
       "      <td>0.99808</td>\n",
       "      <td>3.40</td>\n",
       "      <td>0.52</td>\n",
       "      <td>10.20</td>\n",
       "      <td>3</td>\n",
       "      <td>4</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1505</th>\n",
       "      <td>6.7</td>\n",
       "      <td>0.760</td>\n",
       "      <td>0.02</td>\n",
       "      <td>1.80</td>\n",
       "      <td>0.078</td>\n",
       "      <td>6.0</td>\n",
       "      <td>12.0</td>\n",
       "      <td>0.99600</td>\n",
       "      <td>3.55</td>\n",
       "      <td>0.63</td>\n",
       "      <td>9.95</td>\n",
       "      <td>3</td>\n",
       "      <td>5</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
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      "text/plain": [
       "              fixed acidity  volatile acidity  citric acid  residual sugar   \n",
       "quality                                                                      \n",
       "3       899             8.3             1.020         0.02            3.40  \\\n",
       "        1299            7.6             1.580         0.00            2.10   \n",
       "        690             7.4             1.185         0.00            4.25   \n",
       "        1478            7.1             0.875         0.05            5.70   \n",
       "        1505            6.7             0.760         0.02            1.80   \n",
       "\n",
       "              chlorides  free sulfur dioxide  total sulfur dioxide  density   \n",
       "quality                                                                       \n",
       "3       899       0.084                  6.0                  11.0  0.99892  \\\n",
       "        1299      0.137                  5.0                   9.0  0.99476   \n",
       "        690       0.097                  5.0                  14.0  0.99660   \n",
       "        1478      0.082                  3.0                  14.0  0.99808   \n",
       "        1505      0.078                  6.0                  12.0  0.99600   \n",
       "\n",
       "                pH  sulphates  alcohol  quality  alc_content_rank  \n",
       "quality                                                            \n",
       "3       899   3.48       0.49    11.00        3                 1  \n",
       "        1299  3.50       0.40    10.90        3                 2  \n",
       "        690   3.63       0.54    10.70        3                 3  \n",
       "        1478  3.40       0.52    10.20        3                 4  \n",
       "        1505  3.55       0.63     9.95        3                 5  "
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dframe_alc_rank.head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "tags": []
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "quality\n",
       "5    681\n",
       "6    638\n",
       "7    199\n",
       "4     53\n",
       "8     18\n",
       "3     10\n",
       "Name: count, dtype: int64"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# qualityごとの本数を計算します。\n",
    "\n",
    "num_of_qual = dframe_alc_rank['quality'].value_counts()\n",
    "num_of_qual"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "# 行の名前と列にqualityがあるので、行の名前を変更\n",
    "\n",
    "dframe_alc_rank.index = dframe_alc_rank.index.rename(['idx_quality', 'index'])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "tags": []
   },
   "outputs": [
    {
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       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th>fixed acidity</th>\n",
       "      <th>volatile acidity</th>\n",
       "      <th>citric acid</th>\n",
       "      <th>residual sugar</th>\n",
       "      <th>chlorides</th>\n",
       "      <th>free sulfur dioxide</th>\n",
       "      <th>total sulfur dioxide</th>\n",
       "      <th>density</th>\n",
       "      <th>pH</th>\n",
       "      <th>sulphates</th>\n",
       "      <th>alcohol</th>\n",
       "      <th>quality</th>\n",
       "      <th>alc_content_rank</th>\n",
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       "    <tr>\n",
       "      <th>idx_quality</th>\n",
       "      <th>index</th>\n",
       "      <th></th>\n",
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       "      <th></th>\n",
       "      <th></th>\n",
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       "  <tbody>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <th>899</th>\n",
       "      <td>8.3</td>\n",
       "      <td>1.02</td>\n",
       "      <td>0.02</td>\n",
       "      <td>3.4</td>\n",
       "      <td>0.084</td>\n",
       "      <td>6.0</td>\n",
       "      <td>11.0</td>\n",
       "      <td>0.99892</td>\n",
       "      <td>3.48</td>\n",
       "      <td>0.49</td>\n",
       "      <td>11.0</td>\n",
       "      <td>3</td>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <th>45</th>\n",
       "      <td>4.6</td>\n",
       "      <td>0.52</td>\n",
       "      <td>0.15</td>\n",
       "      <td>2.1</td>\n",
       "      <td>0.054</td>\n",
       "      <td>8.0</td>\n",
       "      <td>65.0</td>\n",
       "      <td>0.99340</td>\n",
       "      <td>3.90</td>\n",
       "      <td>0.56</td>\n",
       "      <td>13.1</td>\n",
       "      <td>4</td>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>5</th>\n",
       "      <th>652</th>\n",
       "      <td>15.9</td>\n",
       "      <td>0.36</td>\n",
       "      <td>0.65</td>\n",
       "      <td>7.5</td>\n",
       "      <td>0.096</td>\n",
       "      <td>22.0</td>\n",
       "      <td>71.0</td>\n",
       "      <td>0.99760</td>\n",
       "      <td>2.98</td>\n",
       "      <td>0.84</td>\n",
       "      <td>14.9</td>\n",
       "      <td>5</td>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>6</th>\n",
       "      <th>142</th>\n",
       "      <td>5.2</td>\n",
       "      <td>0.34</td>\n",
       "      <td>0.00</td>\n",
       "      <td>1.8</td>\n",
       "      <td>0.050</td>\n",
       "      <td>27.0</td>\n",
       "      <td>63.0</td>\n",
       "      <td>0.99160</td>\n",
       "      <td>3.68</td>\n",
       "      <td>0.79</td>\n",
       "      <td>14.0</td>\n",
       "      <td>6</td>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>7</th>\n",
       "      <th>821</th>\n",
       "      <td>4.9</td>\n",
       "      <td>0.42</td>\n",
       "      <td>0.00</td>\n",
       "      <td>2.1</td>\n",
       "      <td>0.048</td>\n",
       "      <td>16.0</td>\n",
       "      <td>42.0</td>\n",
       "      <td>0.99154</td>\n",
       "      <td>3.71</td>\n",
       "      <td>0.74</td>\n",
       "      <td>14.0</td>\n",
       "      <td>7</td>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>8</th>\n",
       "      <th>588</th>\n",
       "      <td>5.0</td>\n",
       "      <td>0.42</td>\n",
       "      <td>0.24</td>\n",
       "      <td>2.0</td>\n",
       "      <td>0.060</td>\n",
       "      <td>19.0</td>\n",
       "      <td>50.0</td>\n",
       "      <td>0.99170</td>\n",
       "      <td>3.72</td>\n",
       "      <td>0.74</td>\n",
       "      <td>14.0</td>\n",
       "      <td>8</td>\n",
       "      <td>1</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "                   fixed acidity  volatile acidity  citric acid   \n",
       "idx_quality index                                                 \n",
       "3           899              8.3              1.02         0.02  \\\n",
       "4           45               4.6              0.52         0.15   \n",
       "5           652             15.9              0.36         0.65   \n",
       "6           142              5.2              0.34         0.00   \n",
       "7           821              4.9              0.42         0.00   \n",
       "8           588              5.0              0.42         0.24   \n",
       "\n",
       "                   residual sugar  chlorides  free sulfur dioxide   \n",
       "idx_quality index                                                   \n",
       "3           899               3.4      0.084                  6.0  \\\n",
       "4           45                2.1      0.054                  8.0   \n",
       "5           652               7.5      0.096                 22.0   \n",
       "6           142               1.8      0.050                 27.0   \n",
       "7           821               2.1      0.048                 16.0   \n",
       "8           588               2.0      0.060                 19.0   \n",
       "\n",
       "                   total sulfur dioxide  density    pH  sulphates  alcohol   \n",
       "idx_quality index                                                            \n",
       "3           899                    11.0  0.99892  3.48       0.49     11.0  \\\n",
       "4           45                     65.0  0.99340  3.90       0.56     13.1   \n",
       "5           652                    71.0  0.99760  2.98       0.84     14.9   \n",
       "6           142                    63.0  0.99160  3.68       0.79     14.0   \n",
       "7           821                    42.0  0.99154  3.71       0.74     14.0   \n",
       "8           588                    50.0  0.99170  3.72       0.74     14.0   \n",
       "\n",
       "                   quality  alc_content_rank  \n",
       "idx_quality index                             \n",
       "3           899          3                 1  \n",
       "4           45           4                 1  \n",
       "5           652          5                 1  \n",
       "6           142          6                 1  \n",
       "7           821          7                 1  \n",
       "8           588          8                 1  "
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# それぞれのランクから、一番アルコール度数が高いワインを抽出します。\n",
    "\n",
    "dframe_alc_rank[dframe_alc_rank['alc_content_rank'] == 1].sort_values('quality')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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